log4j.properties Configuration Guide

1 year ago
Olivia Parker
2 minutes

The log4j.properties file is the configuration file for log4j. By configuring this file, you can control the logging behavior of log4j.

The format of the log4j.properties file is as follows:

# Global logging configuration
log4j.rootLogger=level, appenderName

# Appender configuration
log4j.appender.appenderName=appenderClass
log4j.appender.appenderName.property1=value1
log4j.appender.appenderName.property2=value2
...

# Logger configuration
log4j.logger.loggerName=level, appenderName

# Property configuration
log4j.property.propertyName=value

The following provides a detailed explanation of commonly used configuration items in the configuration file.

  1. Setting up logging parameters globally
  2. log4j.rootLogger: Sets the global root log level and root log output destination.
  3. Configuration for adding something onto.
  4. Specify the name of an appender.
  5. configures properties of the appender
  6. Logging setup:
  7. log4j.logger.loggerName: Specifies the name of a logger.
  8. Configure the logger’s log level and output destination using the format log4j.logger.loggerName=level, appenderName.
  9. Arrangement of property configuration.
  10. log4j.property.propertyName=value: Configures a custom property for log4j.

There are several commonly used appenders:

  1. ConsoleAppender: Output logs to the console.
  2. FileAppender: output the log to a file.
  3. DailyRollingFileAppender: Generates a log file every day.
  4. RollingFileAppender creates a new log file when the current log file reaches a certain size threshold.

There are several commonly used log levels:

  1. DEBUG: The lowest level of logging, used for debugging purposes.
  2. INFO: Used to display the running status of the program.
  3. WARNING: Used for displaying warning messages.
  4. ERROR: Used to display error messages.
  5. FATAL: The highest level of logging used to output severe errors.

In addition to the configuration options mentioned above, log4j also supports various other configuration options that can be adjusted according to specific needs.

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